QTR-MD-08A Reflectance Sensor Array: 8-Channel, 8mm Pitch, Analog Output Shipping:1 day com/store/teensy41

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which gives you a lot of flexibility in how you can put them together and what you can mount to them (see the bumper cage kit dimension diagram (152k pdf) for more information)

it keeps a minimum number of IO port that facilitates users’ own developments of this device

You can see the suggested config

Details for item #4979

QTR-MD-08A Reflectance Sensor Array: 8-Channel, 8mm Pitch, Analog Output Shipping:1 day com/store/teensy41pitch sensors size (mm) output max current optimal range LEDs board 8mm8 61. 0 20. 0 analogous 30 mA 125 mA 5 mm This array of IR LED phototransistor pairs is great for precisely identifying changes in reflectance (like line detection). It operates from 2. 9 V to 5. 5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark readings, but high